The Values of these lens properties change as objective lenses change, except? A

Question

The Values of these lens properties change as objective lenses change, except?
A) size of the lens aperture
B) length of body tube
C) the working distance
C) total manification of the image

Bacteria Cells have?
a) a net negative change
B) no charges and are neutral
c) a net positive charge
d) Equal amounts of positive charges particles

For a mordanr to have desires effect, it should be added?
a) before the dried smear is fixed
B) after floading the smear with a dye
c) between fixing and staining with a dye
d) to make the smear spread thinner

A transparent medium with refractive index of 1.50 will have characteristics of?
a) air.                  c)water
B) vacuum.         d) glass

Which pair of microscope shows the final image in 3-D?

Explanation / Answer

1)The Values of these lens properties change as objective lenses change, except:

d) total manification of the image.

2)a) Bacterial cell wall has a net negative charge.

The reason of this negative charge is the presence of teichoic acids linked to either the peptidoglycan or to the underlying plasma membrane. These teichoic acids are negatively charged because of presence of phosphate in their structure.

3)For a mordanr to have desires effect, it should be added:

c) between fixing and staining with a dye

4)A transparent medium with refractive index of 1.50 will have characteristics of

d)Glass.

5)Which pair of microscope shows the final image in 3-D is

Tilt-pair.

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